2014-01-10

Ripping vinyl on Linux

 I've been ripping a lot of stuff from vinyl to FLAC recently. Here's how I do it.

I have an Alesis I/O 2, which works well and seems fairly decent quality.

First, most important, step, is to stop trying to use Audacity. It's incredibly broken and unreliable. Go get ocenaudio instead. It's fairly new, but it works reliably.

After monitoring your levels, record the whole thing into ocenaudio.

First trim the lead-in and lead-out, and the time when you turned over the record. Then you can delete the few samples for any loud clicks. ocenaudio doesn't seem to have a "draw sample" function yet, the only thing I miss from Audacity, but deleting just a few samples is usually fine.

Normalise everything.

Then, zooming into the breaks, add a marker with control-K.

You'll see references to using zero-crossing finders to split tracks. This is always a bad idea - it's simply not reliable enough, especially with an old crackly record, isopropyl'd or not.

Zoom all the way out again, make sure the number of tracks is right.

Then Edit->Split Audio At Markers.

Save all the parts. I just save them out as WAV first, with the default file names, as it's quicker.

Then it's conversion to FLAC time:

$ for i in untitled* ; do flac "$i" -o "$i.flac"; done
$ cat ~/bin/dotag 
#!/bin/bash

#usage: dotag "The Birthday Party" "Junk Yard" tracklist.txt untitled*.flac

artist=$1
shift
album=$1
shift

#echo "args $*"
tlist=$1
shift
echo tlist is $tlist
nr=1
cat $tlist | while read track; do
 echo "$1: $artist - $album - $nr $track"
 #id3tag -a"$artist" -A"$album" -s"$track" -t$nr "$1"
 metaflac --remove-all "$1"
 metaflac --set-tag="ARTIST=$artist" --set-tag="ALBUM=$album" \
    --set-tag="TRACKNUMBER=$nr" --set-tag="TITLE=$track" "$1"
 nr=$((nr + 1))
 shift
done

$ dotag "The Fall" "Dragnet" tracks untitled\ 8.flac untitled\ 9.flac untitled\ 1*.flac

After that, use easytag to rename the files into a proper directory, and we're done.  

2012-05-31

Recording on Linux with Alesis io|2

A little note for myself: to get low-latency monitoring, and more importantly, record at the right rate, you need to set the Configuration-Profile to "Digital Stereo Input" in pavucontrol !

2011-02-22

PayPal idiocy

This is unbelievably stupid of Paypal. I just got this email from them:


vinyl tap records would like you to use PayPal - the safer, easier way to pay and get paid online.
To send vinyl tap records your payment and see the details of this invoice, copy and paste this link into your web browser:

https://www.paypal.com/uk/cmd=_prq&id=...

So much for "never click a URL in email". Even worse, if you log in separately, the request is not visible anywhere. Morons.

2011-02-18

NatWest phishing service

I got some NatWest phishing spam the other day and was amused to notice this:


<title>NatWest - Security Information</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<link rel="stylesheet" type="text/css" href="http://www.natwest.com/microsites/global/phishing_demo/includes/css/generic.css" media="all" />
...
<a href="http://www.natwest.com/"><img src="http://www.natwest.com/microsites/global/phishing_demo/images/h_logo.gif" alt="NatWest - Load home page" /></a>


Enterprising of them to actually uses NatWest's explanation of phishing to ... phish.

2011-02-03

Name and shame time

To quote 123-reg customer support:

> When will you be supporting AAAA records?

There are no current plans to implement this but notifications will be sent out if this takes place.

2011-01-05

Avoid vps247 hosting


Late last year, I was forced to find a new host for movementarian.org, as my previous hosting provider (Blue Room Hosting, who were really great) were shutting down. I went with VPS247, as they were local to Manchester and seemed reasonable.


Unfortunately my experience has been terrible. They've failed to keep the machines on the net, regularly causing ssh sessions to die. The dmesg is full of warnings about the block drivers failing to write for more than two minutes: evidently the SAN setup they have is totally unreliable.


My VM went down for a significant amount of time and support were very slow to respond. During the total outage, there were no status updates, and no response on the support tickets or the forums. The penultimate straw was when my filesystem was massively corrupted. Even though my VM is hardly critical, I can't be doing with unreliability like this, especially when they're not reachable when problems occur.


My final straw, though, was when I discovered they'd deleted all the negative comments from the Client Comments section of their forum. That's really, really, not on.


I'm now with linode and happy (so far).

2010-09-02

pbranch curiosities

I've started using pbranch extension for hg more seriously. It works nicely but is a little rough around the edges, in particular:



No hg qpop/push equivalent


I really miss this. I find myself constantly doing hg pgraph to figure out where I am and then typing the patch above or below.



No way to shelve a patch


With MQ, I can easily guard a patch to temporarily remove it from the queue. There doesn't seem to be a simple way to do that with pbranch.



Editing patch messages.


You use peditmessage, but because this modifies the repository, you then have to always hg pmerge -all. This pops to the top and causes a bunch of extra changesets, and it gets annoying quickly. And frustratingly, these patch messages do *not* appear in the repo history. So your code reviews of the main repo are just showered in useless merge messages, instead of the actual commit message you care about.



No pfinish


I don't know why, but there's no way to automatically commit a patch as a single changeset on the root default tip, then close the patch branch.



Inserting and deleting patches is horrible


Yuck - I really hope this gets easier soon.



Showing the current patch history


A little tip not mentioned on the pbranch site: the way to show the changelog history of the current patch is to do hg log -b patchname.


Re-enable Ctrl-Alt-Backspace in Xorg

Create the following as /etc/hal/fdi/policy/30user/10-x11-zap.fdi:

<?xml version="1.0" encoding="UTF-8"?>
<deviceinfo version="0.2">
<device>
<!--
Default X.org input configuration is defined in:
/etc/hal/fdi/policy/30user/10-x11-input.fdi
Settings here modify or override the default configuration.
See comment in the file above for more information.

To see the currently active hal X.org input configuration
run lshal or hal-device(1m) and search for "input.x11*" keys.

Hal and X must be restarted for changes here to take any effect
-->
<match key="info.capabilities" contains="input.keys">
<merge key="input.x11_options.XkbOptions" type="string">terminate:ctrl_alt_bksp</merge>
</match>
</device>
</deviceinfo>

and then restart hald and Xorg.

Disabling that goddamn GTK bell


echo 'gtk-error-bell = 0' >>$HOME/.gtkrc-2.0

2010-01-31

Changing liferea keyboard shortcuts

Liferea has no keyboard shortcut editor itself, but "Toggle unread status" demands the wrist-breaking chord action of Control-U. It expects you to be able to edit the shortcuts via the editable menu feature of GTK+.


Unfortunately that's disabled on all modern GNOME installs, and there's no UI for re-enabling it. As usual, gconf-editor to the rescue. The key you need to change is /desktop/gnome/interface/can_change_accels. After re-starting Liferea, you can then edit via hovering over the menu item and pressing the combination. Of course, this in itself is buggy: if it clashes with a menu accelerator (as 'r' is), it will perform that action instead.


It's simpler to directly edit the accels file in your Liferea dot dir.

2010-01-26

Epson all-in-ones: avoid like the plague

Browsing the net, you might get the impression that Epson Stylus All-in-ones are well supported under Linux. Unfortunately this is not the case. The pipslite driver you have to install is extremely flaky, and Fedora SELinux doesn't work properly with it. There's no "draft" mode for some bizarre reason; printing is extremely slow and often randomly cancels half-printed jobs due to USB resets

The scanner doesn't work at all with the iscan software, despite claims to the contrary.

Setting up JACK on Fedora 12

Audacity is somewhat of a broken joke these days, so I needed to use Ardour to record. And that meant setting up JACK. Since JACK insists on exclusivity, I also needed to route pulseaudio through JACK so I could use other apps at the same time. Unfortunately, this is a bit of a pig to figure out. I hacked it as follows:


First edit /etc/pulse/default.pa, you need to add two lines:


load-module module-jack-sink
load-module module-jack-source

In theory now, a restart of pulseaudio should start using JACK for recording and playback, if jackd is running. However, it tends not to work very well: you might find PA hanging and you have to kill -9 it.


This isn't enough of course, now when you log in again, gnome-session will try to start pulseaudio, but not jackd, so nothing works. It's far from the right way, but I edited /usr/bin/start-pulseaudio-x11 (which is started from a /etc/xdg/autostart/ script), as follows:

amixer -c 0 sset 'Input Source' 'Line'

nohup jackd -d alsa &

sleep 5

/usr/bin/pulseaudio --start "$@"

Note that I have to set the input source by hand: something in desktop start up used to do this for me, but now I'm going through JACK it has to be done by hand.

2010-01-17

Liferea strict feed validation tip


New versions of Liferea refuse to parse any feed that fails to validate, even for relatively "minor" problems (the libxml2 recovery facility is no longer used; besides, it abandons the rest of the feed when it hits such problems). I don't want to use Google Reader, since I don't like the interface.


Typically bad feeds have things like high-bit chars or bare ampersands. Thankfully, there's a "conversion filter" feature that you can use to work around the bad feeds. On the two bad feeds, I run this filter:


[moz@pent ~]$ cat bin/fix-ampersands
#!/bin/bash

sed 's/\o226/&amp;/g' | sed 's/& /\&amp;/g' | sed 's/\o243/GBP/g'

2009-11-10

The main indicators of egotism as I intend it here are are loud self-display, insecurity, constant approval-seeking, overinflating one’s accomplishments, touchiness about slights, and territorial twitchiness about one’s expertise. My claim is that egotism is a disease of the incapable, and vanishes or nearly vanishes among the super-capable.


I’m the crippled kid who became a black-belt martial artist and teacher of martial artists. I’ve made the New York Times bestseller list as a writer. You can hardly use a browser, a cellphone, or a game console without relying on my code. I’ve been a session musician on two records. I’ve blown up the software industry once, reinvented the hacker culture twice, and am without doubt one of the dozen most famous geeks alive.


No prizes for guessing who this was.

2009-10-20

A horrible little ElementTree gotcha

What does this print:


from lxml import etree
doc = etree.fromstring('<a><b><c/></b></a>')
newdoc = etree.ElementTree(doc.find('b'))
print newdoc.xpath('/b/c')[0].xpath('/a')


The answer is: [<Element a at 817548c>]. The first point to note is that xpath() against an element is only relative to that element: any absolute XPaths enumerate from the top of the containing tree. The second point is that the shallow copying of etree means that _Element::xpath, unlike _ElementTree::xpath, evaluates absolute paths from the top of the original underlying tree! So even though there's no <a> in newdoc, an absolute XPath on a child element can still reach it.
Yuck.

2009-10-19

YouTube annoyance

How much time would it really take to order multi-part videos, so the suggestion at the end of the video is the next part? Please!

2009-10-10

An annoying Python gotcha

Imagine you have this in mod.py:


import foo

class bar(object):
...

def __del__(self):
foo.cleanup(self.myhandle)

Seems fine right? In fact, there's a nasty bug here. If I try to use this module in client.py like so:

import mod
mybar = bar()


Then you're likely to get an exception when the program exits. This is because Python, for some bizarre reason, Nones out the globals in mod.py when taking down the interpreter. The actual __del__ method can be called sometime after this, and it ends up trying None.cleanup(), with the resultant AttributeError. It seems extremely bizarre that it happens in this order, but it does (a real example).

2009-06-04

Kernel solipsism

Thomas Gleixner:


Exactly that's the point. Adding dom0 makes life easier for a group of users who decided to use Xen some time ago, but what Ingo wants is technical improvement of the kernel... The kernel policy always was and still is to accept only those features which have a technical benefit to the code base.


It boggles the mind that someone could get things so backwards. The kernel exists to provide services to the outside world, not the other way around. By all means criticise the details of the Xen dom0 code, but this argument makes zero sense. How precisely did x86_64 support provide a technical benefit to the code base?

2009-05-18

BNP

Charlie Brooker on the BNP party political broadcast:

Nick Griffin's first line is "Don't turn it off!", which in terms of opening gambits is about as enticing as hearing someone shout "Try not to be sick!" immediately prior to intercourse.

2009-03-26

Outputting XML in standard Python

Is it really this ugly? I expected something like this:


doc = xmldoc()
doc.start('foo', { 'id': 'blah' })
doc.start('sub')
doc.text('subtext')
doc.close('sub')
doc.close('foo')
print doc


and I thought I had it in SimpleXMLWriter. However, I have to jump hoops to get it to output to a string, and it doesn't have any pretty-print. I tried using ElementTree, but that also doesn't pretty print! libxml2 is horribly low-level. lxml seems to do pretty printing, but it's still just as ugly as the best option I've found so far, xml.dom.minidom:


from xml.dom.minidom import Document
foo = doc.createElement('foo')
foo.setAttribute('id', 'blah')
doc.appendChild(foo)
sub = doc.createElement('sub')
sub.appendChild(doc.createTextNode('subtext'))
foo.appendChild(sub)


Yuck! If I'm building up a document, I almost always want to append directly at the last point: why do I have to keep track of all these elements by hand? I presume I'm missing some small standard helper module, but #python didn't know about it. Anyone?